ImageDevice is used to render PDF pages to image targets.
type ImageDevice struct {
// OutputWidth represents the width of the rendered images in pixels.
// The heights of the output images are calculated based on the selected
// width and the original height of each rendered page.
OutputWidth int
// contains filtered or unexported fields
}
func NewImageDevice() *ImageDevice
NewImageDevice returns a new image device.
func (d *ImageDevice) Render(page *model.PdfPage) (image.Image, error)
Render converts the specified PDF page into an image, flattens annotations by default and returns the result.
func (d *ImageDevice) RenderToPath(page *model.PdfPage, outputPath string) error
RenderToPath converts the specified PDF page into an image and saves the result at the specified location.
func (d *ImageDevice) RenderWithOpts(page *model.PdfPage, skipFlattening bool) (image.Image, error)
RenderWithOpts converts the specified PDF page into an image, optionally flattens annotations and returns the result.
func (d *ImageDevice) SetInterpolator(interpolator xdraw.Interpolator)
SetInterpolator sets the interpolation algorithm to use for image scaling and transformations. The interpolator determines the quality of image scaling. Available interpolators from golang.org/x/image/draw include:
- draw.NearestNeighbor (fastest, lowest quality) - draw.ApproxBiLinear (fast, good quality) - draw.BiLinear (balanced, default) - draw.CatmullRom (high quality, slower)
PdfShadingType defines PDF shading types. Source: PDF32000_2008.pdf. Chapter 8.7.4.5
type PdfShadingType int64
const (
ShadingTypeFunctionBased PdfShadingType = 1
ShadingTypeAxial PdfShadingType = 2
ShadingTypeRadial PdfShadingType = 3
ShadingTypeFreeForm PdfShadingType = 4
ShadingTypeLatticeForm PdfShadingType = 5
ShadingTypeCoons PdfShadingType = 6
ShadingTypeTensorProduct PdfShadingType = 7
)
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